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dominant

the allele that is expressed, regardless of the other allele

recessive allele

the allele that is expressed only if there is no dominant allele present

heterozygous

having different alleles for a particular gene

homozygous

having two identical alleles for a particular gene

genotype

: the actual genetic makeup (for example: FF, Ff, or ff)

phenotype

the observable physical traits (for example: purple flower color

recessive inherited disease like cystic fibrosis.

Heterozygous parents are carriers of the disease-causing allele

dominant inherited disease

One dominant allele is needed to show disease
Dominant lethal alleles are usually eliminated from the population

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